Home > product menu > GAS Series In case of that there is the thread of a screw on the installation surface, it can be used with that one side is filled with the lock nut. In case of that there is only the hole on the installation surface, it can be used with that both sides are filled with the lock nut.     If the stop collar is used, the bottoming phenomenon can be prevented. In case of the 36 Series, it can be installed by using the rectangular flange.